Monk and hermit. Cures worked at Saint Madron’s Church, Cornwall, England. Honoured in Brittany. Like many holy people of the time, there is a well that is considered “his”, and is noted for its healing powers. Tradition says that you ask for healing from some ill, then leave a piece of cloth from your clothing at the well; as the cloth deteriorates, the illness dissipates.

Out of pagan darkness in the land of Cornwall thou didst shine as a witness to Christ. Holy hermit Madern, entreat Him that the light thou didst kindle may ever shine in our hearts. – Troparion of Saint Madern